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VSO Data Model: Version 1.8
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VSO Data Model
Version 1.8
- DRAFT -
Introduction
The VSO Data Model provides a set of template descriptions for information
required to describe, access, and search solar data sets in a variety of
archives. It is an abstract model, not a suggested set of keywords to be
used in data nor in databases. Because of the ubiquity of the FITS standard
and the wide use of certain conventions, we provide illustrative values of
FITS keywords for certain data elements; but neither the adoption of any
set of particular keywords nor the FITS data model at all are required
for a data description to conform to the model. The VSO Element Names,
are used at a level of abstraction once removed from the search parameters
of the data providers. They should be completely internal to the VSO
procedures for decoding information from user interfaces, not sent in
in queries to data providers. We have deliberately avoided the use of
FITS-compatible keyword names to emphasize this point.
VSO Search Parameters
VSO search parameters are those data descriptors for which queries
are supported by the VSO in behalf of client applications or requests.
These are the parameters that can best discriminate among a large
collection of heterogeneous data. They must therefore be supported
by the data providers as search parameters applicable to a large
subset of the data archives. They must map to parameters in the
server data dictionaries in a well-defined and meaningful way.
They must also be selected so that the number of data sets meeting
a particular selection criterion is small compared to the total number:
for the VSO an astronomical type search parameter of Object (Sun) is
not particularly useful as a discriminator.
The VSO search parameters are divided into a few groups, each
described under one of the major subsections. These categories are
understood to be orthogonal, in the sense that they can be used to
constr"
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